The last sentence applies only if your life total is being reduced by damage. Other effects or costs (such as “lose 1 life” or “pay 1 life”) can reduce your life total below 1 as normal.

9/25/2006

You can’t pay more life than you have.

9/25/2006

If your life total goes below 1, being dealt damage will not increase it back up to 1.

9/25/2006

After the effect wears off during the cleanup step, you’ll lose the game if your total is 0 or less (or you have ten or more poison counters).

9/25/2006

Angel’s Grace doesn’t prevent damage. It only changes the result of damage dealt to you. For example, a creature with lifelink that deals damage to you will still cause its controller to gain life, even if that damage would reduce your life total to less than 1.

6/7/2013

Players still get priority while a card with split second is on the stack.

6/7/2013

Split second doesn’t prevent players from activating mana abilities.

6/7/2013

Split second doesn’t prevent triggered abilities from triggering. If one does, its controller puts it on the stack and chooses targets for it, if any. Those abilities will resolve as normal.

6/7/2013

Split second doesn’t prevent players from performing special actions. Notably, players may turn face-down creatures face up while a spell with split second is on the stack.

6/7/2013

Casting a spell with split second won’t affect spells and abilities that are already on the stack.

6/7/2013

If the resolution of a triggered ability involves casting a spell, that spell can’t be cast if a spell with split second is on the stack.